Foundry-mixer



H. S. SIMPSON.

FOUNDRY MIXER.

APPLICATION FILED Aue.14. 191s.

' 1,337,333. Patentedhpr. 20, 1920.

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FOUNDRY MIXER.

APPLICATION FILED Auc.|4. 1918.

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H. S SIMPSON.

FOUNDRY MIXER.

APPLICATION FILED AU( .-l4| 191a.

Patented Apr. 20, 1920.

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H. S. SIMPSON. FOUNDRY MIXER- APPLICATION FILED AUG.I4. I918.

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UNITED STATES PATENT OFFICE.

HERBERT S. SIMPSON, 0F EVANSTON, ILLINOIS.

FOUNDRY-MIXER.

Application filed August 14, 1918. Serial No.

To all whom it ma concern Be it known t at I, HERBERT S. SIMrsoN, a citizen of the United States, and a resident of the city of Evanston, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in F oundry-Mixers; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the numerals of reference marked thereon, which form a part of this specification.

It has been found in foundry practice when new and old molding sand is mixed by means of a shovel or by the use of a mixer of the pug mill type, that the grains of the new sand are not properly incorporated with the old or black sand, but stand apart from the surrounding black sand. The heavy construction of the mullers in old types of mixers act to break the grain of the sand instead of mulling and kneading the sand to form a plastic and tough mixture. I

This invention relates to an improved type of foundry mixer wherein the mullers and mixing blades or plows are constructed to not only thoroughly mix the sand but also act to mull, squeeze and knead the grains of each kind of sand to change the mixture from a friable and loose condition into a plastic and tough mass without breaking the grain of the sand.

It is an object of this invention to pro-.

vide a foundry mixer adapted to thoroughly mull and knead old and new sands to form a tough and plastic mass which is adapted to be discharged through the bottom of the mixer when sufficiently mixed.

It is also an object of the invention to construct a sand mixer wherein plows are adapted to mix and turn sands and move the mixture into the path of mullers which mull and knead the mixture to make the same'tough and plastic.

A further object of the invention is' the construction of a foundry mixer having the mullers thereof disposed to operate at different distances from the center-to afford a large mulling and kneading area for mixing foundry sands. Y

Another object of the invention is the construction of a foundry sand mixer where Specification of Letters Patent.

in elevation taken on line 6-6, of Fig. 4

Patented Apr.20, 1920.

in the mullers and plows are simultaneously operable to first mix and knead the sand and then discharge the mixture through a chute by manually releasing a trap door. It is furthermore an object of the invent1on to construct a foundry mixer provided with sets of sand turners adapted to turn and throw the sand inwardly and outwardly into the path of rotating mullers which act to mull and knead the sand.

It is an important object of this invention to provide a mixer for foundry sands, said mixer having plows and mullers disposed at different distances from the center of the mixer to cover a large area and thereby facilitate the mixing and kneading of. the sands to form a tough and plastic mixture which is adapted to be discharged through a maiiiially controlled trap provided on the bottom of the mixer for the purpose.

. Other and further important objects of this invention will be apparent from the disclosures in the specification and draw- I of the trap door portion of the mixing pan.

Fig. 6 is an enlarged detail section partly with parts broken away.

Fig. 7 is a fragmentary detail section taken on line 77, of Fig. 5.

Fig. "8 is a fragmentary detail portion of the pan showing part of the door operating mechanism.

Fig. 9 is a fragmentary detail section taken on line 9-9, of Fig. 5.

Fig. 10 is an enlarged vertical central section taken through one of the mullers.

Fig. 11 is an enlarged top plan view of the outer or double plow.

Fig.12 is a front elevation thereof.

' are bearing s ectively through which a vertical central riving s aft 13, projects. Secured upon terial, and havin rigidly mounted on the top thereof paral el supports, legs or standards 3 and 4, respectively. Securely mounted upon the tops of the standards 3 and 4, and

spanning the space therebetween is a round pan, container or mixing box'comprisin a circular bottom frame or spider 5, provided with integral reinforcing ribs 6, and having an integral peripheral flange or rim 7, which extends above and below said frame. The frame 5, is centrally apertured and has inte 'grally formed centrally on the bottom thereof around said aperture a bearing sleeve or collar 8. Also integrally formed centrally, upon the top of the frame 5, around the aperture therein is an upwardly directed supporting casting, turret or bearing'drum 9, provided with an integral inwardlg pro ecting bearing sleeve 01' collar 10, isposed within the collars 8 and 1 tubes or liners 11 and 12, re-

the lower projecting end of the shaft '13, below the collar 8, is a bevel gear 14, which meshes with a bevel driving pinion 15. The pinion 15, is securely mounted on the inner end of an axle 16, supported in downwardly directed bearing brackets 17 integrally formed on the bottom of the frame 5. The

axle 16, projects outwardly beyond frame 5, and the ends of the pan supports and has mounted thereon a driving pulley 18,, and a loose idler pulley 19, adjacent thereto.

7 The floor or bottom plate of the pan com.-

prises a plurality of small segment shapedv plates 20, and a large segment plate 21,,havmg an outlet or discharge opening 22, the outer portion thereof. he plates 20 and 21, are disposed ad'acent one another to form a flat surface or oor, and are rigidly secured to the frame 5-, by rivets, bolts or any other.

suitablemeans. Secured to the inside of the upwardly projecting portion of the flange.

rim 7 by means of bolt 23, is a circular band or cylinder 24, which forms the vertical circular wall of the pan. Rigidly secured to the bottom of the frame 5, and projecting outwardly between the supports 3 and 4, is a chute'or discharge hopper 25. The chute 25, is disposed below the discharge opening 22, in the floor plate 21. Rotatably journaled in bearings 26, formed on the bottom of the frame 5, is a shaft or axle 27, upon which is secured the inner end of a trap door 28, shaped to permit the same to close the discharge opening 22. The shaft 27, projects outwardly through a bearing 29, secured to the outside of the pan flange 7. Mounted on the outer extending end of the door shaft 27 is a lever 30. A bracket 31, is mounted upon the outside of the pan cylinder 24, above and to one side of the door shaft 27. Pivotally mounted upon the bracket 31, is a latch, stop or locking arm 32, the lower or free end of which, when in vertical or hanging'position is adapted to be contacted by the lever 30, to limit the upward movement thereof and thereby hold the door 28, locked in closed horizontal position.

Disposed upon the top of the drum 9, is a bearing plate or disk 33, which is centrally apertured to permit the main shaft 13, to project upwardly therethrough. Keyed 01' otherwise secured to the upper pro ectingend of the main shaft 13, and resting upon the bearing disk 33, is a driving spider emsecured therein, as shown in Fig. 14 on which is adjustably supported a bracket 39. As disclosed inF i 1,*the bracket 39 projects inwardly at rig t angles to said arm 38, and has journaled therein a stub shaft 40. Intcgrally formed on a journal box 39, of the bracket 39, is an upwardly and inwardly curved elbow 41, which projects over the top of the spider spoke 35. For the purpose of adjusting the bracket 39, on the pin 38', an screw 42, is threaded thro h the elbow 41, and contacts the spoke 35. lock nut 43, is engaged on the screw 42, to hold the same locked in an adjusted position. E aged on the stub shaft 40, to

the outside'o the bracket 39, is a bearing 7 bracket 39. A packing 47, is placed in said recess around the hub 46, and is held in po-' sition by a retainer ring plate 48. The muller 45 is provided with a wide tread surfaoe.' To bracket 39,. properly positioned, retaining plates 49,, are removably attached to the ends of the stub-shaft 40, by means of screws 50. A flanged cap 51, is removably secured centrally to the outer surface of the muller 45, to prevent sand from getting into the muller bearing.

Integrally formed to the outside of the arm 38, is a block 52 which is also integral with the spider spoke 36. Rigidly secured by means of screw bolts 53, to the outer or front surface of the block 52, is the upper end of a vertical strap or bar 54. An outwardly curved inner plow or blade 55, is secured to the lower front side of the supporting bar 54, b means of bolts or rivets 56.

Said inner p ow extends inwardly beyond one side of the bar 54, and outwardly toward the pan cylinder 24, and has a reduced end 57, which projects below and to the front of the muller 45, for the purpose of turning and throwing the sand outwardly into the path of said muller. The upper portion of the bar 54, is provided with vertical slots 58, through which the screw .bolts 53, project to afford a means for raising or lowering the plow 55, if desired.

Formed integrally on the outer end of the spider spoke 37, and at right angles thereto is a support 59, having secured axially therein a peg, pin or axle 60, the ends of which project beyond the ends of said support 59. Adjustably supported upon one projecting end of the axle 60, is an inwardly projecting bracket 61, having a journal box 62, integrally formed thereon at right angles to the support 59. Integrally formed on the bracket 61, and to the back of the journal box 62, is an u wardly and inwardly curved elbow 63, whic projects over the top of the spider ring 34. For the purpose of adjusting the bracket 61, on the axle 60, an adjusting screw 64, is threaded through the elbow 63, and contacts the spider ring 34. A lock nut 65, is engaged on the screw 64, to hold the same locked in an adjusted position. A wheel or muller 66, is journaled on a stub shaft supported by the journal box 62, similar to the construction shown in Fig. 10, with the exception that the hub member 46, of the muller 45, is omitted in the construction of the muller 66, to permit said muller 46, to be disposed nearer the main shaft 13, than the muller 45. The mullers 45 and 66, are positioned diametrically opposite one another.

-Adjustably mounted upon the other extending end of the axle 60, is a bracket 67 which is parallel to the spider spoke 37 and the mullers 45 and 66. Integrally formed on the bracket 67, is an upwardly directed elbow 68, which projects over the top of a lug 69, integrally formed on the spider spoke 37. For adjusting the bracket 67, on the axle 60, an adjusting screw 70, is threaded through the elbow 68, and contacts the lug 69. A lock nut 71, is engaged on the adjusting screw 70, to hold the same locked in an adjusted position. Integrally formed on the outer end of the bracket 67 is a yoke 72, having blocks 73, integrally formed on the ends of the yoke'arnis. Rigidly secured to the outer face of each of the yoke blocks 73, by means of screw bolts 74, is the upper end of a support strap or bar 75. Secured by screw bolts 76, to the lower portion of the same inwardly. turn and move the same mixture alternately the inner surface of of the supporting bars 75, is a curved plow or turning blade 77, having the working or lower edge directed innwardly. A curved plow or turning blade 78, is rigidly secured to the lower portion of the inner surface of the other supporting bar 75. Rigidly secured vertically on the outer plow 78, by screw bolts 79, is the mounting plate 80, of a curved vertical spring 81. The outer plows 77 and 78, are positioned at different distances from the pan cylinder walls 24, with the plow 78, nearest the wall. The yoke arms are of different lengths. The lower portions -of the outwardly convex plows 77 and 7 8, are directed inwardly to turn and throw the sand inward toward the center of the pan, while the outwardly convex inner plow 55, has the lower margin directed outwardly to turn and throw the sand outwardly toward the pan rim or wall 24. Due to the action of the plows the sand to be mixed is heaped highest in the path of the wide tread mullers 45 and 66, which are also disposed at different distances from the center of the pan to permit the same to tread a greater area of the floor of the pan.

The operation is as follows:

With the parts assembled as described and as shown in Figs. 1 and 2, old and new molding sand together with any other iiigredients which may be necessary, are deposited in the open pan 24, upon the floor 20-21. The trap door 28, is held in closed locked position by means ofthe latch 32, against which the lever 30, engages. To start the mixer a driving belt on the idler pulley 19, is shifted to the pulley 18, which is rotated and thereby causes rotation of the driving bevel pinion 15 and the bevel gear 14, which meshes therewith. The main shaft 13, is consequently rotated thereby revolving the driving spider 34, secured on the upper end thereof. The revolving action of the spider simultaneously carries the plows 55, 77 and 7 8, and the mullers 45 and 66, therewith, said mullers revolving on their own axis around the center of the pan. The function of the inner plow 55, is to turn over and move the sand mixture outwardly, while the outer plows 77 and 78,

act to turn over the sand mixture and throw Said plows'thus act to outwardand inward into the pathway of the wide tread mullers 45 and 66. while the flexible member 81, secured on the convex sur face of the plow 78, serves to scrape the inner surface of the pan rim 24.

The revolving mullers 45 and 66, operate in a pathway where the sand mixture is heapedhighest by the action of tho plows, and said revolving mullers act to thoroughly squeeze, roll and knead all of the elements of the mixture regardless of its com posit on,

. said spider and. adapted to' v adjusting the said bracket, a yoke formed on the free end of said bracket, a

and a to change the mixture from a friable and loose condition into a strong, tough 'and plastic mass without breaking the gram of the sand, and therefore malntalmng the original porosity and openness of the mixture.

When the mixture has been sufliciently mulled and kneaded, the latch 32, is manually swung upwardly out of engagement with the lever 30, which is tlien pulled u wardly to swing the door 28, downwar y- To raise or lower the,p1ow 55, the bar 54,

may be raised or lowered by loosening the bolts 53, and sliding the bar with respect thereto. Adjustment of the bar 54, is permitted by the vertical slots 58, through which the screw bolts 53, project. The mullers and plows may be locked in a predetermined adjusted position by means of the respective locking nuts engaged on the adjusting screws. V

I am aware that numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

I claim as my invention: I 1. A mixer comprising a material container, means permitting discharge of mixed materials, a spider in said container, means for rotating the same, an axle supported by said spider, a bracket adjustably mounted at one end of the axle, a muller journaled on said bracket, a second bracket adjustably mounted on the other end of the axle, a yoke member 1inte ml with said second bracket,

ow arms 0 the yoke member.

2. A mixer of the class described comprising a pan, a spider rotatably' mounted therein, means for rotating said spider, a bracket pivotally mounted on said spider, anelbow formed thereon pgojecting over plow blade secured .on each end of said yoke for turning over and mixing materials in said pan, and means on one of said plow blades for scraping the inner walls of said pan.

3. A mixer embracing a pan, a spider mounted therein, means for rotating the tainer, means permitting lade mounted on each of the.

actuated for spider, a verticall adjustable bar mounted on said spider, a p ow blade mounted on said 7 adjustab bar, a bracket pivotally mounted on said spider, means on said bracket for adjusting the same. with respect to said mixed materials, a spider 1n said container,

means for rotating the s ider, an axle su ported by said spider, a racket adjustab y mounted at one end of the axle, a muller j ournaled on saidbracket, a second bracket parallel to the first bracket and adjustably mounted on the other end of the axle, a yoke member integral with said second bracket, a plow blade mounted on each of the arms of said yoke member, a third bracket adjustably mounted on the spider and par allel to the other two brackets, and a second muller journaled on said third bracket.

5. A mixer comprisingl amaterial conscharge of mixed materials, a spider in said container, means for rotating the same, a vertically adjustable plow mounted on the spider, an axle supported by the spider, a bracket adjustably mounted on one end of the axle, a muller journaled on said bracket, a second bracket parallel to the first bracket and adjustably mounted on the other end of said axle, a yoke member integral with said second bracket, a plow mounted on each of the arms of said yoke member, a third mixed materials from said pan, a spider mounted in said. an, means for rotating sa1d s ider, an a e earned by said splder,

a brac et member pivotall 'mounted on each 'endof said axle, a curve member integral with each of said bracket members and projecting over said spider, an adjusting member on each of said curved members for adjusting said bracket members, means for holding said bracket members locked in an adjusted position, a muller journaled on one of said bracket members for squeezing or kneading the materialsdn saidpan, and

plows on the other of said bracket members for turning. and throwing the materials into the path of said muller.

7. A mixer comprising a material container, a supportingmember mounted therein, means for rotating said sup rting member, a plurality of parallel b acket members pivotally mounted on said supporting member, means for adjusting said subscribed my name in the presence of two bracket members, plow blades carried by subscribing Witnesses.

one of said bracket members for turning over the material in said container, and HERBLRT SIMPSON 5 rolling and kneading mullers journaled on Witnesses:

the other of said bracket members. CHARLES W. HILLS, J r.,

In testimony whereof I have hereunto EARL M. HARDINE. 

